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Characteristics of matter that can be seen through direct observation such as density, melting point, and boiling point.
Characteristics of matter that can only observed when one substances changes into a different substance, such as iron into rust.
A chart that organizes the elements by their chemical properties and increasing atomic number.
Atomic mass unit
A unit of mass equal to 1.66 * 10^-24 grams, which is one twelfth the mass of the isotope carbon-12.
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